linux-kernel - Re: Error building v5.5-git on PowerPC32

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Message-ID: <20200206233325.GA3036478@rani.riverdale.lan>
Date:   Thu, 6 Feb 2020 18:33:26 -0500
From:   Arvind Sankar <nivedita@...m.mit.edu>
To:     Arvind Sankar <nivedita@...m.mit.edu>
Cc:     Larry Finger <Larry.Finger@...inger.net>,
        Ville Syrjälä <ville.syrjala@...ux.intel.com>,
        Tom Anderson <thomasanderson@...gle.com>,
        Hans Verkuil <hansverk@...co.com>,
        Manasi Navare <manasi.d.navare@...el.com>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: Error building v5.5-git on PowerPC32 - bisected to commit
 7befe621ff81

On Thu, Feb 06, 2020 at 06:12:13PM -0500, Arvind Sankar wrote:
> On Thu, Feb 06, 2020 at 04:46:52PM -0600, Larry Finger wrote:
> > When building post V5.5 on my PowerBook G4 Aluminum, the build failed with the 
> > following error:
> 
> It's not that the attributes are wrong. The problem is that BUILD_BUG_ON
> requires a compile-time evaluatable condition. gcc-4.6 is apparently not
> good enough at optimizing to reduce that expression to a constant,
> though it was able to do it with the array accesses.

Should have noted, it fails on x86 too with gcc-4.6.4, not specific to PPC.